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A commercial building burns near downtown Memphis, Tenn., on Saturday, April 26, 2014. Officials say four Memphis firefighters were rescued from the burning building after a wall collapsed on them. (AP Photo/Mark Humphrey)

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Deandre Wright takes a picture of himself as he watches a nearby commercial building burn near downtown Memphis, Tenn., on Saturday, April 26, 2014. Officials say four Memphis firefighters were rescued from the burning building after a wall collapsed on them. (AP Photo/Mark Humphrey)

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People survey the damage Saturday, April 26, 2014, after a tornado touched down along Black Jack-Simpson Road in Greenville, N.C. on Friday, April 25, 2014. (AP Photo/The Daily Reflector, Aileen Devlin)

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Siding from a home damaged Saturday, April 26, 2014, after a tornado touched down along Black Jack-Simpson Road on Friday, April 25, 2014. (AP Photo/The Daily Reflector, Aileen Devlin)

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A man goes throws a pile of clothing Saturday, April 26, 2014, from the debris after a tornado touched down along Black Jack-Simpson Road on Friday, April 25, 2014. (AP Photo/The Daily Reflector, Aileen Devlin)

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A man tries to salvage belongings from a overturned mobile home in Greenville, N.C. on Saturday, April 26, 2014 after a tornado touched down along Black Jack Simpson Road on Friday. Officials said multiple tornadoes damaged more than 200 homes the previous day and sent more than a dozen people to the emergency room. (AP Photo/The Daily Reflector, Aileen Devlin)

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ADVANCE FOR USE SATURDAY, APRIL 26 - In this photo taken on April 5, 2014, Rich Hayes of Jerome, Idaho, helps the Idaho Department of Fish and Game plant sagebrush and bitterbrush seedlings in burned areas of the Big Cottonwood Wildlife Management Area near Oakley, Idaho. (AP Photo/The Times-News, Virginia Hutchins) MANDATORY CREDIT

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ADVANCE FOR USE SATURDAY, APRIL 26 - In this photo taken on April 5, 2014, Paige Blumenthal, left, and Tucker Petterson, both of Twin Falls, Idaho, help the Idaho Department of Fish and Game plant sagebrush and bitterbrush seedlings in burned areas of the Big Cottonwood Wildlife Management Area near Oakley, Idaho. (AP Photo/The Times-News, Virginia Hutchins) MANDATORY CREDIT